关键词: 巨厚坚硬岩层, 超前支承压力, 演化规律, 机械模拟实验方法, 变异特征

Abstract: In order to reveal the influence of the migration of thick and hard stratum on the evolution law and variation characteristics of the front abutment pressure of working face, taking the typical super thick and hard rock formation condition of a mine as the model, by means of physical simulation experiment method and mechanical simulation experiment method, the model is compared with the model of no thick and hard stratum in overlying strata.Through research, it has been found that the influence of super thick and hard stratum on the front abutment pressure of working face mainly concentrates in the stage before the breaking of super thick and hard stratum. At this time, the stress concentration degree in front of working face is high, the influence range is wide, and the influence degree is severe. When the super thick and hard stratum is about to break, for the working face with super thick and hard stratum in the overlying strata, the peak value and influence range of the front abutment pressure are 1.15 and 1.9 times as large as those without super thick and hard stratum respectively. When the super thick and hard stratum is stable or broken, for the working face with super thick and hard stratum in the overlying strata, peak value of the front abutment pressure and the influence range are relatively small comparing with working face without super thick and hard stratum in the overlying strata, the influence on the working face is relatively weak. The increase of the peak value of the front abutment pressure will inevitably lead to an increase of the influence area of the coal wall in front of the working face.